Washer, Key5310-00-950-5503

NSN 5310-00-950-5503 · NIIN 009505503 · Part number 1T269

Caterpillar Inc Div Caterpillar Defense · FSC 5310 — Nuts and Washers · FSG 53 — Hardware and Abrasives · CAGE 11083

Government record, cited

NSN 5310-00-950-5503 — this item is cataloged by the U.S. Government under National Stock Number 5310-00-950-5503. Manufacturer of record part number: 1T269.

Also searched as 5310-00-950-5503 · 5310009505503 · NIIN 009505503 · 00-950-5503 · FSC 5310 Nuts and Washers · CAGE 11083 · 1T269 · M2282P · 1T0269

Nearby stock numbers ← 5310-00-950-5055 · 5310-00-950-5665 Washer, Key →

5310-00-950-5503 — Nuts and Washers

Features

Washer,key — FSC 5310
Internal Straight Key Width: 0.240 INCHES NOMINAL IN
Distance From Centerline to Top of Internal Key: 1.412 INCHES NOMINAL IN
Heat Treatment: HOT ROLLED
Hardness Rating: 85.0 ROCKWELL SUPERFICIAL 15-N MINIMUM
Style Designator: KEY
Outside Diameter: 4.160 INCHES NOMINAL IN
Material Thickness: 0.120 INCHES NOMINAL IN

Identification

NSN: 5310-00-950-5503
NIIN: 009505503
FSC: 5310 — Nuts and Washers
FSG: 53 — Hardware and Abrasives
Primary part number: 1T269
Manufacturer: Caterpillar Inc Div Caterpillar Defense

General Description

The Washer,key, cataloged under National Stock Number 5310-00-950-5503, is classified within Federal Supply Class 5310 (Nuts and Washers) of the Hardware and Abrasives group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	5310-00-950-5503
Primary Part Number	1T269
Item Name	Washer,key
FSC / FSG	5310 / 53 — Nuts and Washers
Manufacturer	Caterpillar Inc Div Caterpillar Defense
Status	ACTIVE
Internal Straight Key Width	0.240 INCHES NOMINAL IN
Distance From Centerline to Top of Internal Key	1.412 INCHES NOMINAL IN
Heat Treatment	HOT ROLLED
Hardness Rating	85.0 ROCKWELL SUPERFICIAL 15-N MINIMUM
Style Designator	KEY
Outside Diameter	4.160 INCHES NOMINAL IN
Material Thickness	0.120 INCHES NOMINAL IN
Material	STEEL COMP 1010 OVERALL
Internal Key Quantity	2
Hole Diameter	3.170 INCHES NOMINAL IN

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

Cross-Reference Index

Part Number	Manufacturer
1T269 PRIMARY	Caterpillar Inc Div Caterpillar Defense (USA)
M2282P	Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic (USA)
1T0269	Caterpillar Inc Div Caterpillar Defense (USA)

No interchangeability data on file.

Other items in FSC 5310 — Nuts and Washers

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

5310-00-000-0040

5310-00-000-0040 · Item name not on file

5310-00-000-0077

NUT,PLAIN,ROUND

5310-00-000-0079

WASHER,FLAT

5310-00-000-0079

WASHER,FLAT

5310-00-000-1146

5310-00-000-1146 · Item name not on file

5310-00-000-3815

5310-00-000-3815 · Item name not on file

5310-00-000-4532

5310-00-000-4532 · Item name not on file

5310-00-000-4540

5310-00-000-4540 · Item name not on file

Frequently Asked Questions

What is NSN 5310-00-950-5503?

NSN 5310-00-950-5503 is a Washer,key, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 5310, Nuts and Washers. Status: active.

What part numbers are listed for NSN 5310-00-950-5503?

NSN 5310-00-950-5503 has 3 manufacturer part numbers on file: 1T269 (Caterpillar Inc Div Caterpillar Defense), M2282P (Twin Disc, Incorporated Dba Twin Disc Mid-Atlantic), 1T0269 (Caterpillar Inc Div Caterpillar Defense).

What are the specifications of 1T269?

Key specifications for 1T269: Internal Straight Key Width: 0.240 INCHES NOMINAL IN; Distance From Centerline to Top of Internal Key: 1.412 INCHES NOMINAL IN; Heat Treatment: HOT ROLLED; Hardness Rating: 85.0 ROCKWELL SUPERFICIAL 15-N MINIMUM. 10 specifications are documented in the U.S. Government catalog.

Is NSN 5310-00-950-5503 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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